Sine die is Latin and is defined as indefinitely, or without a future date set.
An example of sine die is a meeting ending with no date set for the next meeting.
without (a) day (being set for meeting again); for an indefinite period: to adjourn an assembly sine die
Origin of sine dieLate Latin
Without a day specified for a future meeting; indefinitely: Parliament was dismissed sine die.
Origin of sine dieMedieval LatinLatin sine without Latin diē ablative of diēs day
sine die - Legal Definition
Without day. With no day being assigned for the next meeting or for resumption of meeting.